i don't remember frankly all the facts regarding that. he did come -- he came, i thought, before 2008, made one visit. >> schieffer: did he? >> i know this -- >> schieffer: they had to do a waiver to get him in to the country. >> well, that's probably correct. i do know this. he came to my institute, institute that was named for me at rice university in houston, texas, in 1999. and just to give you a sense of the greatness of this man, 12-year-old boy asked him after his presentation, how do you want to be remembered, mr. mandela, everyone talks about how you're almost a saint and mandela said, son, he said, i'm no saint. i am not an angel, he said. in fact i am no saint unless you consider a saint to be a sinner who keeps on trying.